[MacPorts] #55166: port:ffmpeg should use --x86asmexe=EXE=${prefix}/bin/<assembler>

[MacPorts]

#55166: port:ffmpeg should use  --x86asmexe=EXE=${prefix}/bin/<assembler>
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 Reporter:  RJVB    |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  ffmpeg
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 I had a port:ffmpeg 3.4 build failure in an assembly file, and noticed
 `nasm` was being used instead of yasm.

 Nasm is what ffmpeg will use by default, so that's what it will use if one
 has both port:nasm and port:yasm installed.

 I didn't check if my issue was in fact due to having an older nasm version
 installed, but port:ffmpeg should indicate the expected assembler binary
 explicitly (e.g.  `--x86asmexe=EXE=${prefix}/bin/yasm` or depend on
 port:nasm, of course).

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Ticket URL: <https://trac.macports.org/ticket/55166>
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